Papers by Keyword: Vacuum Sintering

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Authors: K.E. Belyavin, D.V. Minko, N.V. Reshnetikov
Abstract: A technology of hardening porous materials of titan powders has been elaborated. The technology is based on passing alternating current with duration of ~10-1…101 s through porous (35…40%) blanks made by method of Sintering by Electric Discharge (SED) by passing a pulse of current with duration of ~10-5…10-3 s. The influence of technological regimes of porous blanks treatment on their structure and properties is investigated. Geometry and dimension of contact necks between powder particles of obtained samples are evaluated. Variations of porosity and strengths as well as microstructure of porous samples materials before and after treatment are investigated. Optimum range of treatment technological regimes is determined within which porosity of 30…35% with maximum strength values.
Authors: Li Yuan Niu, Zi Mu Shi, Ji Jing Lin, Yong Li, Lin Chao Xu, Lan Zhao
Abstract: Foam magnesium alloy was an idea substitute of hard tissue of human bodies because its elasticity module was close to the bone of human. In the paper, foam degradable magnesium alloys were prepared by “Press-Dissolution-Vacuum sintering-Hot treatment-Aging” powder manufacturing process firstly. Then samples were coated by immersion in a bath containing phosphate and rare earths lanthanum. Results show that, Mg-0.9Mn foam magnesium alloys after hot treatment had better anticorrosion performance; and coated foam magnesium alloys form the bath with phosphate lanthanum chloride had lower rate of degradation.
Authors: C. Steven Wright, A.S. Wronski, Yves Bienvenu, L. Fontaine, D. Girodin, J. Kinder, O. Faral, R. Wahling
Authors: Eniko Volceanov, Ştefania Motoc, Adrian Volceanov, Rodica M. Neagu, Cristian Coman
Authors: Jun Yang, Shao Chun Xu, Ya Ru Cui
Abstract: High purity Ti3SiC2 ceramic was synthesized by mechanical alloying and vacuum sintering. The effect of aluminum (Al) content on the properties and processing of Ti3SiC2 was investigated. The results showed that proper addition of a definite amount of Al could obviously increase the purity of Ti3SiC2, and was favorable for reducing the sintering temperature of Ti3SiC2.
Authors: Ryoichi Furushima, Kiyotaka Katou, Koji Shimojima, Hiroyuki Hosokawa, Akihiro Matsumoto
Abstract: WC-FeAl composites were fabricated by vacuum sintering technique from mixture of WC and FeAl powders containing various oxygen content. Mechanical properties such as hardness, fracture toughness and transverse rupture strength were influenced by the oxygen content in the powders. Control of the oxygen content was succeeded by changing the powder preparation process. Contrary to expectations, the reduction of oxygen content led to degrade the fracture toughness and transverse rupture strength of the composites. This result was attributed to the microstructural change in the sintered composite. The sintered composite of lower oxygen content exhibited WC grain growth or inhomogeneous microstructure, which can be the cause of degradation of those mechanical properties. It was concluded that the oxygen content was one of the key factors to influence the microstructure or mechanical properties of WC-FeAl composites.
Authors: Bing Liang Liang, Chen Zhang, Yun Long Ai, Chang Hong Liu, Wen He, Wei Hua Chen, Jin Zhi Wen
Abstract: WC-8Co cemented carbide specimens were prepared via vacuum sintering. The influences of sintering time on phase composition, microstructure and mechanical properties of WC-8Co cemented carbide were investigated. The results show that dense specimens were obtained in the sintering time range of 15min~60min and the relative density reached over 95%. Only WC and Co3W3C (γ-phase) were detected by XRD without any else phases, even though Co. With the ascended sintering time, the transverse rupture strength (TRS) increased and hardness ascended to peak value and then descended. WC-Co cemented carbide with excellent mechanical properties (HRA>90, TRS~630MPa and KIC>7MPa·m1/2) were obtained. It would be a good candidate for applications of friction stir welding tool.
Authors: Chong Cai Zhang, Qun Qun Yuan, Quan Wang, Zhi Yong Sheng, Long Wang
Abstract: The W-Ti-Co powders was doped different content of TaC with an average particle size of 270nm were prepared by 72 hours high-energy ball milling. The powder was cold isostatic pressed and vacuum sintered at 1380°C. The physical properties and the micrographs of samples were detected. The main conclusions were as follow: the density and Cobalt magnetic decreased with the content of TaC increasing, the coercivity increased at first and then decreased, the coercivity of alloy with 0.6wt.% TaC was higher than the other. When the content of TaC was less than 0.6wt.%, the hardness increased with the content of TaC increasing .While when the content of TaC was more than 0.6wt.%, the hardness decreased obviously. Comparing with the alloy without TaC doped, the transverse rupture strength (TRS) of the alloy with 0.4wt.%TaC increased to a larger extent. When the content of TaC was more than 0.4wt.%, the transverse rupture strength (TRS) decreased with the content of TaC increasing. The TaC could inhibit the grain growth, and the comprehensive performance of the alloy with 0.4wt.% TaC was best.
Authors: Qing Yang, Jun Tao Zou, Zhao Liu, Xiao Jiang Yu
Abstract: Cu/MgB2 composites with different content of MgB2 (10, 20, 30 vol.%) were fabricated by vacuum sintering of copper and MgB2 powders. The effects of MgB2 content and sintering process on the properties of Cu/MgB2 composites including the microstructures, relative density, electrical conductivity and hardness were then investigated. The results showed that the distribution uniformity of MgB2 on copper matrix decreased obviously with the increase of MgB2 content, the hardness of Cu/MgB2 composites increased and the relative density decreased slightly though the electrical conductivity decreased greatly. The relative density and hardness of Cu/MgB2 composites increased after the repressing-resintering process, the electrical conductivity was also improved slightly.
Authors: Sung Sic Hwang, Sang Whan Park, Chan Mook Kim
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